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arXiv 2021年

作者： Lee, Kang Hao Balachandran, Vinitha Guo, Chu Poletti, Dario Science and Math Cluster Singapore University of Technology and Design 8 Somapah Road 487372 Singapore Henan Key Laboratory of Quantum Information and Cryptography Henan Zhengzhou450000 China Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Department of Physics Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha410081 China Engineering Product Development Pillar Singapore University of Technology and Design 8 Somapah Road 487372 Singapore

We study the transport and spectral property of a segmented diode formed by an XX + XXZ spin chain. This system has been shown to become an ideal rectifier for spin current for large enough anisotropy. Here we show numerical evidence that the system in reverse bias has three different transport regimes depending on the value of the anisotropy: ballistic, diffusive and insulating. In forward bias we encounter two regimes, ballistic and diffusive. The system in forward and reverse bias shows significantly different spectral properties, with distribution of rapidities converging towards different functions. In the presence of dephasing the system becomes diffusive, rectification is significantly reduced, the relaxation gap increases and the spectral properties in forward and reverse bias tend to converge. For large dephasing the relaxation gap decreases again as a result of Quantum Zeno physics. Copyright © 2021, The Authors. All rights reserved.

关键词： Ballistics

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Observation of Dimension-Crossover of a Tunable 1D Dirac Fermion in Topological Semimetal NbSixTe2

arXiv

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arXiv 2022年

作者： Zhang, Jing Lv, Yangyang Feng, Xiaolong Liang, Aiji Xia, Wei Mo, Sung-Kwan Chen, Cheng Xue, Jiamin Yang, Shengyuan A. Yang, Lexian Guo, Yanfeng Chen, Yanbin Chen, Yulin Liu, Zhongkai School of Physical Science and Technology ShanghaiTech University Shanghai201210 China University of Chinese Academy of Sciences Beijing100049 China National Laboratory of Solid-State Microstructures School of Physics Collaborative Innovation Centre of Advanced Microstructures Nanjing University Nanjing210093 China Research Laboratory for Quantum Materials Singapore University of Technology and Design Singapore487372 Singapore ShanghaiTech Laboratory for Topological Physics Shanghai201210 China Advanced Light Source Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Department of Physics University of Oxford OxfordOX1 3PU United Kingdom State Key Laboratory of Low Dimensional Quantum Physics Department of Physics Tsinghua University Beijing100084 China

Condensed matter systems in low dimensions exhibit emergent physics that does not exist in three dimensions. When electrons are confined to one dimension (1D), some significant electronic states appear, such as charge density wave, spin-charge separations and Su-Schrieffer-Heeger (SSH) topological state. However, a clear understanding of how the 1D electronic properties connects with topology is currently lacking. Here we systematically investigated the characteristic 1D Dirac fermion electronic structure originated from the metallic NbTe2chains on the surface of the composition-tunable layered compound NbSixTe2(x = 0.40 and 0.43) using angle-resolved photoemission spectroscopy. We found the Dirac fermion forms a Dirac nodal line structure protected by the combined Myand time-reversal symmetry T and proves the NbSixTe2system as a topological semimetal, in consistent with the ab-initio calculations. As x decreases, the interaction between adjacent NbTe2chains increases and Dirac fermion goes through a dimension-crossover from 1D to 2D, as evidenced by the variation of its Fermi surface and Fermi velocity across the Brillouin zone in consistence with a Dirac SSH model. Our findings demonstrate a tunable 1D Dirac electron system, which offers a versatile platform for the exploration of intriguing 1D physics and device applications. Copyright © 2022, The Authors. All rights reserved.

关键词： Charge density waves

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Time-Reversal-Even Nonlinear Current Induced Spin Polarization

arXiv

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arXiv 2022年

作者： Xiao, Cong Wu, Weikang Wang, Hui Huang, Yue-Xin Feng, Xiaolong Liu, Huiying Guo, Guang-Yu Niu, Qian Yang, Shengyuan A. Department of Physics The University of Hong Kong Hong Kong HKU-UCAS Joint Institute of Theoretical and Computational Physics Hong Kong Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education Shandong University Jinan250061 China Research Laboratory for Quantum Materials Singapore University of Technology and Design Singapore487372 Singapore Department of Physics National Taiwan University Taipei10617 Taiwan Physics Division National Center for Theoretical Sciences Taipei10617 Taiwan School of Physics University of Science and Technology of China Anhui Hefei230026 China

We propose a time-reversal-even spin generation in second order of electric fields, which dominates the current induced spin polarization in a wide class of centrosymmetric nonmagnetic materials, and leads to a novel nonlinear spin-orbit torque in magnets. We reveal a quantum origin of this effect from the momentum space dipole of the anomalous spin polarizability. First-principles calculations predict sizable spin generations in several nonmagnetic hcp metals, in monolayer TiTe2, and in ferromagnetic monolayer MnSe2, which can be detected in experiment. Our work opens up the broad vista of nonlinear spintronics in both nonmagnetic and magnetic systems. © 2022, CC BY.

关键词： Spin polarization

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Energy and entropy: Path from game theory to statistical mechanics

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Physical Review Research 2020年第4期2卷 043055-043055页

作者： S. G. Babajanyan A. E. Allahverdyan Kang Hao Cheong Alikhanyan National Laboratory (Yerevan Physics Institute) Alikhanian Brothers Street 2 Yerevan 375036 Armenia Science Mathematics and Technology Cluster Singapore University of Technology and Design 8 Somapah Road Singapore 487372

Statistical mechanics is based on the interplay between energy and entropy. Here we formalize this interplay via axiomatic bargaining theory (a branch of cooperative game theory), where entropy and negative energy are represented by utilities of two different players. Game-theoretic axioms provide a solution to the thermalization problem, which is complementary to existing physical approaches. We predict thermalization of a nonequilibrium statistical system employing the axiom of affine covariance, related to the freedom of changing initial points and dimensions for entropy and energy, together with the contraction invariance of the entropy-energy diagram. Thermalization to negative temperatures is allowed for active initial states. Demanding a symmetry between players determines the final state to be the Nash solution (well known in game theory), whose derivation is improved as a by-product of our analysis. The approach helps to retrodict nonequilibrium predecessors of a given equilibrium state.

关键词： Classical statistical mechanics Entropy Nonequilibrium statistical mechanics

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Encapsulating PDA-wrapped carbon fibers in waterborne epoxy zinc-rich coatings to enhance the utilization and bonding strength of Zn particles

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Colloids and Surfaces A: Physicochemical and Engineering Aspects 2025年 722卷

作者： Wan-Juan Jiang Haleema Sadia Ding-Feng Yu Pan-Feng Zheng Ze-Hua Dong Hubei Key Laboratory of Material Chemistry and Service Failure School of Chemistry and Chemical Engineering Huazhong University of Science and Technology Wuhan 430074 China Hubei Key Laboratory of Marine Electromagnetic Detection and Control Wuhan Second Ship Design and Research Institute Wuhan Hubei Province 430064 China

Carbon fiber (CF) has been widely employed to enhance the mechanical properties of polymers owing to its superior chemical inertness, high tensile strength, and high conductivity. This study presents a surface chemistry-driven approach to enhance the corrosion resistance and mechanical performance of waterborne zinc-rich epoxy (ZRE) coatings by incorporating polydopamine (PDA)-coated carbon fibers (CF). The PDA layer, abundant in catechol and amine groups, facilitates dual interfacial bonding mechanisms—π-π stacking interactions and hydrogen bonding with the epoxy matrix. This synergistic interfacial engineering not only enhances the colloidal dispersion of CF but also results in an eightfold increase in adhesion strength and a 100 % improvement in tensile strength compared to the pristine ZRE coating. Additionally, the low-frequency impedance (|Z| at 0.01 Hz) is elevated by two orders of magnitude, and the cathodic protection duration provided by Zn is extended more than twofold relative to unmodified ZRE coating. These enhancements are attributed to two synergistic mechanisms: PDA-enhanced CF dispersion forming continuous conductive networks that facilitate electron transfer between zinc particles and the substrate, and amine-epoxy covalent bonding, constructing hierarchical barrier structures that hinder electrolyte penetration.

关键词： Anti-corrosion coating Carbon fibers Cathodic protection Polydopamine Zn–rich epoxy resin

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Computation of reachable sets based on Hamilton-Jacobi-Bellman equation with running cost function

TechRxiv

引用

TechRxiv 2021年

作者： Liao, Wei Liang, Taotao Wei, Xiaohui Lai, Jizhou Yin, Qiaozhi Key laboratory of Fundamental Science for National Defense-Advanced Design Technology of Flight Vehicle State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics Nanjing210016 China The Navigation Research Center Nanjing University of Aeronautics and Astronautics Nanjing210016 China

A novel method for computing reachable sets is proposed in this paper. In the proposed method, a Hamilton-Jacobi-Bellman equation with running cost function is numerically solved and the reachable sets of different time horizons are characterized by a family of nonzero level sets of the solution of the Hamilton-Jacobi-Bellman equation. In addition to the classical reachable set, by setting different running cost functions and terminal conditions of the Hamilton-Jacobi-Bellman equation, the proposed method allows to compute more generalized reachable sets, which are referred to as cost-limited reachable sets. In order to overcome the difficulty of solving the Hamilton-Jacobi-Bellman equation caused by the discontinuity of the solution, a method based on recursion and grid interpolation is employed. At the end of this paper, some examples are taken to illustrate the validity and generality of the proposed method. © 2021, CC BY.

关键词： Numerical methods

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Characterization of the parameters for the refining intensity in terms of performance

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Palpu Chongi Gisul/Journal of Korea Technical Association of the Pulp and Paper Industry 2019年第2期51卷 26-39页

作者： Liu, Huan Dong, Jixian Jing, Hui Guo, Xiya Qiao, Lijie College of Mechanical and Electrical Engineering Shaanxi University of Science and Technology Xi'an Shaanxi Province710021 China China Key Laboratory of Light Industry Equipment Manufacturing Intelligence Xi'an Shaanxi Province710021 China College of Art and Design Shaanxi University of Science and Technology Xi'an Shaanxi Province710021 China

Refining intensity is typically used to measure the efficiency of refining in the pulp and paper industry, and the refining intensity is difficult to analyze due to the various parameters influencing it. In this paper, the previously published refining intensities of a disc refiner were analyzed, and the characterization parameters were proposed. Based on the bar interactions, the refining intensity was established using theoretical derivation. The cut edge length (CEL), the CEL-based characterization parameters and bar interactions (BI) characterization parameters were used to show that the CEL directly reflected the number of bar interaction points, but it had no direct relationship with the bar interaction area (BIA) and bar interaction length (BIL). By analyzing the relationship between the different refining intensities and the properties of the fibers or pulp, it could be concluded that the specific refining energy (SRE) better reflected the variations in the beating degree of the pulp during the refining process compared with the specific surface load (SSL) and Bl-based refining intensities. Also, the intensity based on the bar interaction length (BIL) can better characterize the changes in the average fiber length. However, all the intensities analyzed in this paper do not comprehensively describe the refining process and cannot predict all the parameters of the pulp and fibers but only partly characterize their properties. Therefore, further studies are required to establish a more comprehensive and precise measure of refining intensity. © 2019 Korean Technical Assoc. of the Pulp and Paper Industry. All rights reserved.

关键词： Pulp

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Simultaneous changes in seed size, oil content and protein content driven by selection of SWEET homologues during soybean domestication

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National science Review 2020年第11期7卷 1776-1786页

作者： Shoudong Wang Shulin Liu Jie Wang Kengo Yokosho Bin Zhou Ya-Chi Yu Zhi Liu Wolf B.Frommer Jian Feng Ma Li-Qing Chen Yuefeng Guan Huixia Shou Zhixi Tian State Key Laboratory of Plant Physiology and Biochemistry College of Life sciences Zhejiang University State Key Laboratory of Plant Cell and Chromosome Engineering Institute of Genetics and Developmental Biology Innovation Academy for Seed Design Chinese Academy of Sciences University of Chinese Academy of Sciences College of Resources and Environment Fujian Provincial Key Laboratory of Haixia Applied Plant Systems Biology Fujian Agriculture and Forestry University Institute of Plant Science and Resources Okayama University Institute of Crop Science Anhui Academy of Agricultural Sciences Department of Plant Biology School of Integrative Biology University of Illinois at Urbana-Champaign Institute for Molecular Physiology and Cluster of Excellence on Plant Sciences (CEPLAS) Heinrich Heine University of Düsseldorf FAFU-UCR Joint Center for Horticultural Plant Biology and Metabolomics Haixia Institute of Science and Technology Fujian Agriculture and Forestry University

Soybean accounts for more than half of the global production of oilseed and more than a quarter of the protein used globally for human food and animal feed. Soybean domestication involved parallel increases in seed size and oil content, and a concomitant decrease in protein content. However, science has not yet discovered whether these effects were due to selective pressure on a single gene or multiple genes. Here,re-sequencing data from>800 genotypes revealed a strong selection during soybean domestication on Gm SWEET10a. The selection of Gm SWEET10a conferred simultaneous increases in soybean-seed size and oil content as well as a reduction in the protein content. The result was validated using both near-isogenic lines carrying substitution of haplotype chromosomal segments and transgenic soybeans. Moreover,Gm SWEET10b was found to be functionally redundant with its homologue Gm SWEET10a and to be undergoing selection in current breeding, leading the the elite allele Gm SWEET10b, a potential target for present-day soybean breeding. Both GmSWEET10a and GmSWEET10b were shown to transport sucrose and hexose, contributing to sugar allocation from seed coat to embryo, which consequently determines oil and protein contents and seed size in soybean. We conclude that past selection of optimal Gm SWEET10a alleles drove the initial domestication of multiple soybean-seed traits and that targeted selection of the elite allele Gm SWEET10b may further improve the yield and seed quality of modern soybean cultivars.

关键词： soybean domestication yield seed quality SWEET

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Photoexcitation-Enhanced High-Ionic Conductivity in Polymer Electrolytes for Flexible, All-Solid-State Lithium-Metal Batteries Operating at Room Temperature

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Angewandte Chemie 2024年第5期137卷

作者： Rong-Hao Wang Dr. Weiyi Wang Yu-Zhen Zhang Prof. Dr. Wei Hu Liang Yue Jia-Hao Ni Dr. Wan-Qun Zhang Prof. Dr. Gang Pei Prof. Dr. Shangfeng Yang Dr. Li-Feng Chen Division of Nanomaterials & Chemistry Hefei National Research Center for Physical Sciences at the Microscale School of Chemistry and Materials Science CAS Key Laboratory of Mechanical Behavior and Design of Materials (LMBD) School of Engineering Science University of Science and Technology of China Hefei 230026 Anhui China These authors contributed equally.

designing solid polymer electrolytes (SPEs) with high ionic conductivity for room-temperature operation is essential for advancing flexible all-solid-state energy storage devices. Innovative strategies are urgently required to develop SPEs that are safe, stable, and high-performing. In this work, we introduce photoexcitation-modulated heterojunctions as catalytically active fillers within SPEs, guided by photocatalytic design principles, and meanwhile employ natural bacterial cellulose to improve the compatibility with poly(ethylene oxide), improve the coordination environment of lithium salts, and optimize both ion transport and mechanical properties. In situ photothermal experiments and theoretical calculations reveal that the strong photogenerated electric field produced by trace heterojunctions within poly(ethylene oxide) electrolytes under photoexcitation significantly enhances lithium salt dissociation, increasing the concentration of mobile Li + . This results in a substantial increase in ionic conductivity, reaching 0.135 mS cm −1 at 25 °C, with a Li + transference number as high as 0.46. The flexible all-solid-state lithium-metal pouch cells exhibit an impressive discharge capacity of 178.8 mAh g −1 even after repeated bending and folding, and demonstrate exceptional long-term cycling stability, retaining 86.7 % of their initial capacity after 250 cycles at 1 C (25 °C). This research offers a novel approach to developing high-performance flexible lithium-metal batteries.

关键词： flexible all-solid-state lithium-metal batteries photoexcitation modulation natural bacterial cellulose solid-polymer-based electrolyte electrochemical energy storage device

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High cycling stability, hydrogen-bonds strengthening Mg(NO3)2·6H2O-propionamide composite phase change materials as energy storage material for solar thermal system

引用

Journal of Energy Storage 2025年 125卷

作者： Liu, Cheng Zhang, Yi Zhang, Pengrui Ding, Yigang Sun, Jinhe Key Laboratory of Green Chemical Process of Ministry of Education Hubei Key Laboratory for Novel Reactor and Green Chemical Technology Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education School of Chemical Engineering and Pharmacy Wuhan Institute of Technology Wuhan430073 China Key Laboratory of Green and High-end Utilization of Salt Lake Resources Qinghai Institute of Salt Lakes Chinese Academy of Sciences Xining810008 China Qinghai Engineering and Technology Research Center of Comprehensive Utilization of Salt Lake Resources Xining810008 China Qinghai Chemical Design and Research Institute Co. Ltd Xining810008 China

A multitude of composite phase change materials (PCM) systems have been developed, resulting in significant advancements in the efficiency of solar thermal storage systems. However, there is a paucity of inorganic-organic composite PCMs systems, and the phase change mechanism remains unclear, which significantly constrains the deployment and advancement of this category of PCMs. To address this gap in the literature, this team has developed a novel organic-inorganic composite PCM system using 30 wt% Mg(NO3)2·6H2O (MNH) and 70 wt% propanamide (POA) as raw materials. The thermal physical properties of the PCMs were initially analyzed, and the results demonstrated that the PCMs exhibited favourable latent heat and thermal cycling stability. The melting point was found to be 376.2 K, with a latent heat of melting of 131.93 J·g−1. It was observed that the melting temperature and latent heat remained essentially unaltered after 500 cycles. Subsequently, the structure of the PCMs was analyzed using X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). Ultimately, the interaction between liquid MNH and POA was modeled using molecular dynamics, allowing for a deeper understanding of the phase transition mechanism. It is hypothesized that the hydrogen bonds (HBs) between the two substances affects the physical bond, and that HBs contribute to the PCMs having good stability and a high thermal decomposition temperature. The rational mechanism of this phenomenon is explained from many aspects, including structure, Hirshfeld surface and thermal analysis. It is anticipated that the discovery of this new PCMs will facilitate large-scale applications in solar energy storage. © 2025 Elsevier Ltd

关键词： Fourier transform infrared spectroscopy

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